Alloy 1420 is used: for the manufacture of components transport engineering; for use in aircraft structures (welded hermetic compartments of the edging of the Windows, components, etc.); buildings of the missile; in the land transport (forged wheels).

Note

Sredneprochny corrosion resistant high modulus welded alloy system Al-Mg-Li low density (d = 2,47 g/cm³, E = 78 GPA; properties in the direction of D: σ_in ≥ 420 MPa, σ_0,2 ≥ 270 MPa, δ ≥ 9%).
The use of alloy for the aerospace the reduced mass of the riveted construction to 12%, weld to 24%. Effective use of alloy 1420 for the manufacture of stampings instead of alloy AK6 in connection with a reduced 10% density, high fatigue characteristics and corrosion resistance, modulus of elasticity.
Modification of alloy 1420 — 1421 and 1423, which optionally is alloyed with scandium and differ only in the content of magnesium.

Standards

Name	Code	Standards
Bars and shapes	В52	GOST 13616-97, GOST 13617-97, GOST 13618-97, GOST 13619-97, GOST 13620-90, GOST 13621-90, GOST 13622-91, GOST 13623-90, GOST 13624-90, GOST 13737-90, GOST 13738-91, GOST 17575-90, GOST 17576-97, GOST 29296-92, GOST 29303-92, GOST Р 50066-92, GOST Р 50067-92, GOST Р 50077-92, OST 1 90262-81
Non-ferrous metals, including rare, and their alloys	В51	OST 1 90048-90, OST 1 90296-81
Bars	В55	TU 1-4-013-78
Sheets and strips	В53	TU 1-92-28-84

Chemical composition

Standard	Si	Fe	Cu	Al	Ti	Ca	Zr	Mg	Be	Sc	Na	Li
OST 1 90048-90	≤0.15	≤0.2	≤0.05	Rest	≤0.1	≤0.04	0.08-0.12	4.5-6	0.0002-0.005	≤0.05	≤0.003	1.8-2.2

Al is the base.
According to OST 1 90048-90 the chemical composition is given for alloy 1420. The mass fraction of each other impurity (not regulated) is ≤ 0.05%, the total mass fraction of other impurities is ≤ 0.15%. In the alloy grade 1420 for welded products, the sodium content should not exceed 0.0015%. In the manufacture of molded semi-finished products from the 1420 alloy, a lower limit of lithium content of 1.90% is established. Beryllium is not determined by chemical analysis, but is introduced by calculation.
According to OST 1 90262-81 the allowable content of hydrogen in the metal should not exceed 1.0 cm ³ per 100 g of metal.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %
Sheet metal in delivery condition
	≥270	≥450	≥10
Extruded in the delivered state for OST 1 90262-81. 1420Т - Quenching in water (longitudinal samples)
	≥275	≥412	≥7

Description mechanical marks

Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture

Physical characteristics

Temperature	Е, HPa	r, kg/m³
20	75	2470

A description of the physical symbols

Name	Description
Е	The normal elasticity modulus
r	Density
l	Coefficient of thermal conductivity
R	UD. the resistivity

Alloy 1420 (01420)

Designation

Description